Struct rstubs::arch::int::idt::EntryOptions

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#[repr(transparent)]
pub struct EntryOptions(u16);

Expand description

Represents the options field of an IDT entry.

Tuple Fields§

§0: u16

Implementations§

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impl EntryOptions

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pub const fn new() -> Self

Creates a new default initialized bitfield.

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const STACK_IDX_BITS: usize = 3usize

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const STACK_IDX_OFFSET: usize = 0usize

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const fn with_stack_idx(self, value: u16) -> Self

Index of an interrupt stack

Bits: 0..3

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const fn stack_idx(&self) -> u16

Index of an interrupt stack

Bits: 0..3

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fn set_stack_idx(&mut self, value: u16)

Index of an interrupt stack

Bits: 0..3

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const GATE_BITS: usize = 3usize

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const GATE_OFFSET: usize = 8usize

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pub const fn with_gate(self, value: Gate) -> Self

Gate type

Bits: 8..11

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pub const fn gate(&self) -> Gate

Gate type

Bits: 8..11

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pub fn set_gate(&mut self, value: Gate)

Gate type

Bits: 8..11

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const GATE_32_BITS: usize = 1usize

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const GATE_32_OFFSET: usize = 11usize

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pub const fn with_gate_32(self, value: bool) -> Self

If this is a 32 bit entry

Bits: 11..12

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pub const fn gate_32(&self) -> bool

If this is a 32 bit entry

Bits: 11..12

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pub fn set_gate_32(&mut self, value: bool)

If this is a 32 bit entry

Bits: 11..12

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const PRIVILEGE_LEVEL_BITS: usize = 2usize

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const PRIVILEGE_LEVEL_OFFSET: usize = 13usize

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pub const fn with_privilege_level(self, value: Ring) -> Self

Set the required privilege level (DPL) for invoking the handler. The DPL can be 0 or 3, the default is 0. If CPL < DPL, a general protection fault occurs.

Bits: 13..15

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pub const fn privilege_level(&self) -> Ring

Set the required privilege level (DPL) for invoking the handler. The DPL can be 0 or 3, the default is 0. If CPL < DPL, a general protection fault occurs.

Bits: 13..15

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pub fn set_privilege_level(&mut self, value: Ring)

Set the required privilege level (DPL) for invoking the handler. The DPL can be 0 or 3, the default is 0. If CPL < DPL, a general protection fault occurs.

Bits: 13..15

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const PRESENT_BITS: usize = 1usize

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const PRESENT_OFFSET: usize = 15usize

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pub const fn with_present(self, value: bool) -> Self

Has to be true for valid entries.

Bits: 15..16

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pub const fn present(&self) -> bool

Has to be true for valid entries.

Bits: 15..16

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pub fn set_present(&mut self, value: bool)

Has to be true for valid entries.

Bits: 15..16

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impl EntryOptions

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const fn minimal() -> Self

Creates a minimal options field with all the must-be-one bits set.

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pub const unsafe fn with_stack(self, index: u16) -> Self

Assigns a Interrupt Stack Table (IST) stack to this handler. The CPU will then always switch to the specified stack before the handler is invoked. This allows kernels to recover from corrupt stack pointers (e.g., on kernel stack overflow).

An IST stack is specified by an IST index between 0 and 6 (inclusive). Using the same stack for multiple interrupts can be dangerous when nested interrupts are possible.

This function panics if the index is not in the range 0..7.

§Safety

This function is unsafe because the caller must ensure that the passed stack index is valid and not used by other interrupts. Otherwise, memory safety violations are possible.